Error Code P0308 What It Means & What To Do?

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This diagnostic fault code is a generic powertrain code, which means that it would apply to the OBD-II equipped vehicles. The specific repair steps can vary as it depends upon the vehicle make and model.

The trouble code P0308 can be described as Cylinder 8 Misfire Detected.

The trouble code P0308 would be set when the ECU would detect multiple misfires from cylinder 8. Due to the misfires, the check engine light would be set by the ECU and it would then put the vehicle into the failsafe mode to prevent damage. The check engine light would start illuminating unless and until the fault code is repaired properly.

What causes this problem with the Cylinder 8 Misfire Detected?

• Issue of faulty or worn spark plugs
• The spark plug wires or coils might be defective
• Distributor might start failing
• Flaws in the fuel injector
• There can be a leakage in the vacuum
• Low fuel pressure
• Camshaft sensor might have some flaws
• Defects in the crankshaft sensor
• Engine timing might be off
• Leakage in the head gasket
• The engine compression might be low
• Problem of poor-quality fuel
• Defective ignition parts such as the spark plugs, ignition coils, spark plug boots and wires, or distributors
• Faults in the fuel system parts such as the fuel pressure regulator, fuel injectors, or the EGR valve
• Quirks in the powertrain control module

1. Oxygen Sensor - Defective car Oxygen Sensor can be a major reason why P0308 code depicts. So make sure to replace it online so that you don’t have to face any further issues.
2. Fuel Injector - Everything is okay with the Oxygen Sensor and still OBD code P0308 triggering? Then there must be some defects in Fuel Injector. Replace them as soon as possible.
3. Head Gasket - P0308 code flashing? Get your Head Gasket inspected from a mechanic.
4. Spark Plug - If everything is alright with Head Gasket, then there is surely some defect in Spark Plug. Get it replaced before the situation gets worse.
5. Camshaft Sensor - P0308 code can display due to some issues in the Camshaft Sensor. So it is very important to replace the Camshaft Sensor with us at equitable prices.
6. Powertrain Control Module - Do you remember when was the last time you got your car Powertrain Control Module checked up? A damaged Powertrain Control Module can cause a lot of issues like displaying P0308 code.
7. Crankshaft Sensor - Are there some faults in your Crankshaft Sensor? Don’t waste time and get them replaced or else P0308 code can turn up.

You might be thinking that how would you diagnose these problems? We at Parts Avatar Canada would help you diagnose the major symptoms easily.

Common Symptoms

• There can be lack of power in the engine
• Fuel smell may start coming from the exhaust
• Illumination in the check engine light
• Engine might start running roughly and may shake
• Hesitations/Jerking when accelerating
• The car engine may die
• Engine may not start at all
• The fuel economy might start decreasing

The repairs which you will have to do to correct this fault code are simply straightforward; you can surely pinpoint the necessary repairs on the basis of your diagnosis. Have a look at some common fixes:

• The damaged spark plugs should be replaced
• You can always replace the distributor
• Carefully repair or replace ignition coil
• The defected fuel pressure regulator should be restored
• Fix the leaking vacuum
• If there are some flaws in the fuel injectors, then it should be replaced properly
• Replace the defective powertrain control module

There is no need to get strained if your OBD Code is still flashing up as we are here at your service. Have a look at our superior variety of Coolant Temperature Sensor, Air Fuel Ratio Sensor, Oxygen Sensor and many more. Now all your problems would vanish within no time.

Here are some steps which you should follow in order to diagnose this fault code:

• The first thing a mechanic is likely to do when diagnosing a P0308 code is check the ignition system. If anything is visually wrong with the ignition system, such as something unplugged or broken, then this issue would need to be resolved before any further diagnosis could take place
• If nothing is visually wrong with the ignition system, the mechanic would then test each spark plug and wire with an ignition tester to ensure that each plug is firing. If any issues are found during this test, they must be resolved before any further diagnosis can occur
• If no issues with the ignition system exist, the fuel system is the next stop for the mechanic. A fuel pressure test is likely to be performed to make sure that the fuel pressure regulator is functioning properly.
• Running data on the fuel injectors with an OBD-II scanner is another likely test the mechanic would perform on the fuel system. Any issues found with the fuel system are recommended to be repaired as soon as possible due to the fact that fuel is dangerous. A vacuum test may also be performed around the same time as the fuel pressure test to ensure the engine is producing sufficient vacuum.
• If no issues are found with either of the previous two systems, the next step the mechanic would take is to use a high-tech scan tool to test the powertrain control module for proper function. Any faulty parts found during this diagnosis would be replaced at the customer’s request.

Common Mistakes When Diagnosing The P0308 Code

• Generally, the most common mistake which people make while diagnosing a misfiring code is to replace the spark plug or they might do a tune up
• This procedure usually only has a 50/50 shot of repairing the problem without conducting proper diagnosis
• It is very important to assess each and every aspect of the problem before you start replacing the spark plug to avoid wastage of time and money